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From Pascal Robert <prob...@macti.ca>
Subject Re: Add ActiveRecord support to Cayenne
Date Tue, 18 Dec 2012 20:18:09 GMT

Le 2012-12-18 à 15:08, emeka okafor <emeka_1978@yahoo.com> a écrit :

> Coming from EOF? I think those static helper classes are missing but it is not that bad
either.

They were not part of the regular EOF stuff, they started as EOGenerator templates, and have
been standard with WOLips (with Velocity templates) since at least 2008 (if not before).

> 
> ________________________________
> From: John Huss <johnthuss@gmail.com>
> To: "user@cayenne.apache.org" <user@cayenne.apache.org> 
> Sent: Tuesday, December 18, 2012 7:01 PM
> Subject: Re: Add ActiveRecord support to Cayenne
> 
> I would welcome the addition of some DAO (data access object) methods in
> the entity templates that make it even easier to query the DB.  For example
> I have these defined in my entity template:
> 
> public static List<Invoice> fetchAll(ObjectContext ec);
> 
> public static List<Invoice> fetchAll(ObjectContext ec, List<? extends
> Ordering> sortOrderings);
> 
> public static List<Invoice> fetch(ObjectContext ec, Expression qualifier);
> 
> public static List<Invoice> fetch(ObjectContext ec, Expression qualifier,
> List<? extends Ordering> sortOrderings);
> 
> public static List<Invoice> fetch(ObjectContext ec, Expression qualifier,
> List<? extends Ordering> sortOrderings, int fetchLimit);
> 
> public static Invoice fetchOne(ObjectContext ec, Expression qualifier);
> 
> This is something EOF/WebObjects does that I find useful.  However, I would
> lean towards creating an inner class for this along with a singleton called
> DAO and putting these methods there.  So you would do
> Invoice.DAO.fetchAll(...)
> 
> But I don't really need .delete() or .save()
> 
> 
> On Mon, Dec 17, 2012 at 5:09 PM, Дробеня Илья <drobenyai@tut.by> wrote:
> 
>> Hi!
>> 
>> Now Cayenne usage in projects looks like data mapper (Fowler), but all
>> entities has dependecy on Cayenne (interface Persistent). For data mapper
>> it is disadvantage.
>> But it is acceptable for ActiveRecord. This is my first reason to propose
>> this solution. Second reason - we may simple add all posibile methods in
>> entities - because entities generates by modeler.
>> 
>> Then my proposal - useful API that will be insert in each entity on
>> generation. For example, in this case we may use cayenne such -
>> 
>> Role curRole = Role.newInstance();
>> curRole.setAuthority("MyAuthority");
>> curRole.save();
>> 
>> Role curRole = Role.get(id);
>> curRole.delete();
>> 
>> List<Role> roles = Role.findBy("firstName", name, "surname", lastName);
>> List<Role> roles = Role.findAll("birthDate < $date and name = $name",
>> "date", new Date(), "name", lastName);
>> 
>> How we may to implement this?
>> Need to allow use Cayenne in classic mode without active record. Then we
>> may create separate set of templates and add its to Cayenne jars.
>> 
>> Then for implement its we need:
>> 1. Create separate set of templates with needed methods
>> 2. Create singleton - that will provide access to ObjectContext
>> 3. Maybe add to modeler option for generate custom queries to entities
>> instead of add its to UntitledMap
>> 
>> My questions to you:
>> 1. What do you think - do this functionality will really useful? Are you
>> ready to use it in your projects?
>> 2. Which methods you want to see in API?
>> 
>> Thanks!
>> --
>> Ilya Drabenia
>> Software Engineer, ObjectStyle LLC


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